Paternal Family Tree: Jenkinson
Before 9th June 1881 [his father] George Banks Jenkinson 12th Baronet [aged 30] and [his mother] Madeline Holme-Sumner Lady Jenkinson [aged 20] were married.
On 9th June 1881 Captain John Banks Jenkinson was born to George Banks Jenkinson 12th Baronet [aged 30] and Madeline Holme-Sumner Lady Jenkinson [aged 20].
On 19th January 1892 [his grandfather] George Samuel Jenkinson 11th Baronet [aged 74] died. His son [his father] George [aged 40] succeeded 12th Baronet Jenkinson of Walcot in Oxfordshire and of Hawkesbury in Gloucestershire. [his mother] Madeline Holme-Sumner Lady Jenkinson [aged 30] by marriage Lady Jenkinson of Walcot in Oxfordshire and of Hawkesbury in Gloucestershire.
In 1899 Captain John Banks Jenkinson [aged 17] joined the Rifle Brigade (The Prince Consorts Own) in 1899 and served in the Boer War with the Mounted Infantry (Queen's medal with five clasps).
On 10th March 1900 Captain John Banks Jenkinson [aged 18] gazetted 2nd Lieutenant Rifle Brigade.
On 18th March 1901 Captain John Banks Jenkinson [aged 19] was promoted to Lieutenant.
Around November 1907 Captain John Banks Jenkinson [aged 26] and Joan Hill were married at St George's Church, Hanover Square.
In 1908 Captain John Banks Jenkinson [aged 26] was promoted to Captain.
In or before 1912 Captain John Banks Jenkinson [aged 30] was appointed General Staff Officer, Eastern Command.
On 3rd July 1912 [his son] Anthony Banks Jenkinson 13th Baronet was born to Captain John Banks Jenkinson [aged 31] and [his wife] Joan Hill.
In 1913 Captain John Banks Jenkinson [aged 31] was promoted to Brigade Major, 3rd Infantry Brigade.
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In August 1914 Captain John Banks Jenkinson [aged 33] went to France as Brigade-Major, and was involved in the Retreat from Mons.
On 14th September 1914 or 16th September 1914 Captain John Banks Jenkinson [aged 33] was killed in action. The 3rd Infantry Brigade was in position to the north-west of the village of Vendresse during what would become known as the Battle of the Aisne and he was out in front of the leading battalions carrying out a reconnaissance when he was killed as they advanced from the Marne to the slopes above the Aisne. He was buried at Vendresse Plot I. C. 17.
Kings Wessex: Great x 25 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 22 Grand Son of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 28 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 23 Grand Son of Maredudd ap Bleddyn King Powys
Kings England: Great x 21 Grand Son of King John of England
Kings Scotland: Great x 22 Grand Son of King David I of Scotland
Kings France: Great x 26 Grand Son of Hugh I King of the Franks
Kings Duke Aquitaine: Great x 30 Grand Son of Ranulf I Duke Aquitaine
Great x 4 Grandfather: Robert Jenkinson 2nd Baronet
Great x 3 Grandfather: Colonel Charles Jenkinson
Great x 2 Grandfather: Colonel John Jenkinson
Great x 1 Grandfather: Bishop John Jenkinson
Great x 3 Grandfather: Rear-Admiral John Barker
Great x 2 Grandmother: Frances Barker
Great x 3 Grandmother: Anne Russell Charlton
Grandfather: George Samuel Jenkinson 11th Baronet
Great x 4 Grandfather: Lieutenant-Colonel Jacob Pechell of Owenstown, County Kildare
Great x 3 Grandfather: Paul Pechell 1st Baronet
Great x 4 Grandmother: Jane Boyd
Great x 2 Grandfather: Augustus Pechell of Berkhampstead in Hertfordshire
Great x 4 Grandfather: Thomas Brooke of Paglesham, Essex
Great x 3 Grandmother: Mary Brooke Lady Pechell
Great x 1 Grandmother: Frances Augusta Pechell
Father: George Banks Jenkinson 12th Baronet
Great x 1 Grandfather: Anthony Lyster
Grandmother: Emily Sophia Lyster Lady Jenkinson
Captain John Banks Jenkinson 21 x Great Grandson of King John of England
Grandfather: Arthur Holme-Sumner
Mother: Madeline Holme-Sumner Lady Jenkinson 20 x Great Granddaughter of King John of England
Great x 2 Grandfather: Thomas Kingscote
Great x 1 Grandfather: Colonel Thomas Henry Kingscote of Kingscote Park in Gloucestershire 18 x Great Grandson of King John of England
Great x 4 Grandfather: George Dashwood of Hackney 
15 x Great Grandson of King John of England
Great x 3 Grandfather: Henry Dashwood aka Peyton 1st Baronet 16 x Great Grandson of King John of England
Great x 4 Grandmother: Margaret Peyton 
15 x Great Granddaughter of King John of England
Great x 2 Grandmother: Harriett Peyton 17 x Great Granddaughter of King John of England
Great x 4 Grandfather: John Rous 5th Baronet 
Great x 3 Grandmother: Frances Rous Lady Peyton
Great x 4 Grandmother: Judith Bedingfield
Grandmother: Georgina Emily Kingscote 19 x Great Granddaughter of King John of England
Great x 2 Grandfather: Benjamin Bloomfield 1st Baron Bloomfield
Great x 1 Grandmother: Harriot Mary Anne Bloomfield